Spool



FIG. 1 is a front perspective view of a spool, showing our new design;

FIG. 2 is a rear perspective view of our spool of FIG. 1;

FIG. 3 is a front view of our spool of FIG. 1, the rear view being the same; and,

FIG. 4 is a side view of our spool of FIG. 1, the opposite side view being the same.

The broken line circles on the outer left and outer right sides of FIG. 4 depict environment only. 

The ornamental design for a spool, as shown and described. 